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Red meat consumption associated with increased type 2 diabetes risk

Replacing red meat with plant-based protein sources may reduce risk of diabetes and provide environmental benefits

2023-10-19
(Press-News.org) Key takeaways:

Eating more than one weekly serving of red meat may raise type 2 diabetes risk. Replacing red meat with plant-based protein sources, such as nuts and legumes, may reduce risk of type 2 diabetes. Embargoed for release: Thursday, October 19, 4:00 AM ET

Boston, MA — People who eat just two servings of red meat per week may have an increased risk of developing type 2 diabetes compared to people who eat fewer servings, and the risk increases with greater consumption, according to a new study led by researchers from Harvard T.H. Chan School of Public Health. They also found that replacing red meat with healthy plant-based protein sources, such as nuts and legumes, or modest amounts of dairy foods, was associated with reduced risk of type 2 diabetes.

The study will be published on Thursday, October 19, in The American Journal of Clinical Nutrition.

“Our findings strongly support dietary guidelines that recommend limiting the consumption of red meat, and this applies to both processed and unprocessed red meat,” said first author Xiao Gu, postdoctoral research fellow in the Department of Nutrition.

While previous studies have found a link between red meat consumption and type 2 diabetes risk, this study, which analyzed a large number of type 2 diabetes cases among participants being followed for an extended period of years, adds a greater level of certainty about the association.

Type 2 diabetes rates are increasing rapidly in the U.S. and worldwide. This is concerning not only because the disease is a serious burden, but it also is a major risk factor for cardiovascular and kidney disease, cancer, and dementia.

For this study, the researchers analyzed health data from 216,695 participants from the Nurses’ Health Study (NHS), NHS II, and Health Professionals Follow-up Study (HPFS). Diet was assessed with food frequency questionnaires every two to four years, for up to 36 years. During this time, more than 22,000 participants developed type 2 diabetes.

The researchers found that consumption of red meat, including processed and unprocessed red meat, was strongly associated with increased risk of type 2 diabetes. Participants who ate the most red meat had a 62% higher risk of developing type 2 diabetes compared to those who ate the least. Every additional daily serving of processed red meat was associated with a 46% greater risk of developing type 2 diabetes and every additional daily serving of unprocessed red meat was associated with a 24% greater risk.

The researchers also estimated the potential effects of substituting one daily serving of red meat for another protein source. They found that substituting a serving of nuts and legumes was associated with a 30% lower risk of type 2 diabetes, and substituting a serving of dairy products was associated with a 22% lower risk.

“Given our findings and previous work by others, a limit of about one serving per week of red meat would be reasonable for people wishing to optimize their health and wellbeing,” said senior author Walter Willett, professor of epidemiology and nutrition.

In addition to health benefits, swapping red meat for healthy plant protein sources would help reduce greenhouse gas emissions and climate change, and provide other environmental benefits, according to the researchers.

Other Harvard Chan School authors included Frank Sacks and Frank Hu.

The NHS, NHS II, and HPFS are supported by the National Institute of Health (grants UM1 CA186107, U01 CA176726, and U01 CA167552).

“Red meat intake and risk of type 2 diabetes in a prospective cohort study of US females and males,” Xiao Gu, Jean-Philippe Drouin-Chartier, Frank M. Sacks, Frank B. Hu, Bernard Rosner, Walter C. Willett, The American Journal of Clinical Nutrition, October 19, 2023, doi: 10.1016/j.ajcnut.2023.08.021

Visit the Harvard Chan School website for the latest news, press releases, and multimedia offerings.

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Harvard T.H. Chan School of Public Health brings together dedicated experts from many disciplines to educate new generations of global health leaders and produce powerful ideas that improve the lives and health of people everywhere. As a community of leading scientists, educators, and students, we work together to take innovative ideas from the laboratory to people’s lives—not only making scientific breakthroughs, but also working to change individual behaviors, public policies, and health care practices. Each year, more than 400 faculty members at Harvard Chan School teach 1,000-plus full-time students from around the world and train thousands more through online and executive education courses. Founded in 1913 as the Harvard-MIT School of Health Officers, the School is recognized as America’s oldest professional training program in public health.

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[Press-News.org] Red meat consumption associated with increased type 2 diabetes risk
Replacing red meat with plant-based protein sources may reduce risk of diabetes and provide environmental benefits